Pattern of Purine-Nucleotide Metabolism in Hepatopancreas of Helix Pomatia (Gastropoda)
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In 1970 Campbell and Bishop, describing the nitrogen metabolism in Moluscs, had written: “Terrestrial snails might thus serve as useful systems for investigating the specific derangements present in persons exhibiting the Lesch-Nyhan Syndrome” (1). For several years we have been concerned with the purine-nucleotide metabolism in land snail Helix pomatia (Pulmonata). This gastropod has been found to be purinotelic (11). During winter sleep, H. pomatia accumulates uric acid, which accounts for 75 % of the total purine content in the nephridium at the end of hibernation. During its active life, the nephridial excreta contain uric acid, xanthine and guanine, accounting for 34 – 49, 34 – 55 and 11 – 16 %, respectively of the total amount of purines excreted (12). An enzymic system allowing under normal, physiological conditions such diversity of the end-products of the nitrogen metabolism looked very promising. On the basis of investigations of the enzymes participating in the purine-nucleotide metabolism in the hepatopancreas, which is an organ homologous to the liver of Vertebrates, the scheme presented in Fig. 1. is suggested.
KeywordsUric Acid Adenosine Kinase Terrestrial Snail Adenine Phosphoribosyltransferase Adenine Nucleotide Pool
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